Sphinx-version-warning

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:Date: 2018-07-30

* Use ``READTHEDOCS_PROJECT`` and ``READTHEDOCS_VERSION`` environment variables

* Remove ``versionwarning_enabled`` config since it wasn't used and it's not necessary

* Parse ``versionwarning_messages`` as reStructuredText (https://github.com/humitos/sphinx-version-warning/pull/7)

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:Date: 2018-07-29

* Make banner more configurable (https://github.com/humitos/sphinx-version-warning/pull/6).
New configs (api_url, banner_html, banner_id_div, body_default_selector, body_extra_selector) were added.

* Compatibility with Sphinx 1.7.x added

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:Date: 2018-07-27

* Initial release